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Itinerant to localized transition of $$f$$ electrons in the antiferromagnetic superconductor UPd$$_2$$Al$$_3$$

Fujimori, Shinichi  ; Saito, Yuji ; Okane, Tetsuo ; Fujimori, Atsushi*; Yamagami, Hiroshi*; Haga, Yoshinori ; Yamamoto, Etsuji ; Onuki, Yoshichika*

In heavy Fermion (HF) compounds, $$f$$ electrons show both itinerant and localized behaviour depending on temperature. Above the characteristic temperature $$T^*$$, their magnetic properties are well described by the completely "localized" $$f$$-electron models. On the other hand, well below $$T^*$$, their Fermi surfaces (FS's) have been explained well by the "itinerant" $$f$$-electron model. These two models assume totally different natures of $$f$$-electrons, and how they transform between these states as a function of temperatures has never been understood on the level of their electronic structures. Here we have studied the band structure of the HF antiferromagnetic superconductor UPd$$_2$$Al$$_3$$ well below and above $$T^*$$ by angle-resolved photoelectron spectroscopy (ARPES), and have found that the $$f$$-bands, which form the FS's at low temperatures, are excluded from FS's at high temperatures.

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Category:Physics, Multidisciplinary

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